Carburetor



INMAN GARBURETOR March 11 1924.

Filed Aug. 26 1920 WITNESSES MSL..

Patented Mar. lll, '192th WALTER A. EINMAN, F WAUKEGAN, ELMOJIS.

v cannunn'ron.

.Application :tiled August 26, 192111. Serial No. 406,175.

T 0 all @cham t may concern-J Be it known that l, WALTER A.. lNMAN, acitizen of the United btates. and resident of llvvaukegan, in the countyof Lake and State ot illinois, have invented new vand usefulllinprovements in Carburetors, of which the tfollowing is a description,reference being had to the accompanying drawings, which are a part ot'this specification. i

The invention relates to carburetor-s more particularly for use informing a combustible mixture tor internal combustion engines.

@ne of the objects of this invention is to provide an apparatus forthoroughly mixing liquid :tuel 'by mechanical agitation and churning tosuch to such an extent that some of the fuel is vaporized even thoughthe fuel is not readily volatile under ordinary conditions.

A further object ofthe invention is to provide means tor ,returning lanyunmixed fuel back into the mixing apparatus. l

rl`he invention further consists in the several features-hereinafter setforth and more particularly' delined by claims at the conclusion hereof.

ln the drawings: lig. l is a vertical section view of a device embodyingthe invention, Fig. 2 is a section taken on the line 2-2 of lilig.v 1. 1

ln the drawings the numeral 3 designates a iloat chamber provided with afloat 4 carrying a valve 5 controlling the supply of fuel from a supply.pipe 6. A spring pressed plunger 7 mounted in the chamber 3 may bepressed down against the float 4 for the purpose of priming the chamber,the depressioln of the Hout causing the opening of the va ve 5.

A fuel 'conduit 8 leads from the float chamber to a Well 9 in a chamber10. rlhe passage of fuel from the conduit 8 to the -Well `9 iscontrolled by an adjustable needle valve 1l.

rlhe chamber 10 is provided with an air inl let 12 and a pipe 13 leadsfrom the inlet end thewell 9, so that the air entering the inlet 12 inpassing over the fuel in the well 9 is forced to pass through a,constricted open.-l

ing and by an increased suction etlect carry some of the fuel along withit into the main portion of the chamber.

rllhe innerlvnd of the chamber 10 terminates in a centrally disposedinlet to an irnpeller casing 15 which has a tangentially disposed outlet16 for connection with the intake manifold of the engine.

n impeller 17 has its shalt 18 iournalled in the casing 15 and suitablyconnected to an electric motor 19, preferably one having seriescharacteristics and of low voltage so that it may be run 'from thestarting or ignition battery of a motor driven vehicle. 'lhe impellerwith the casing forms a turbo compressor and also amixing device.

butterflyv or other suitable throttle valve 20 in the outlet 16 controlsthe supply of mixture to the intake manifold and also controls theoperation of the compressor.

'llo prevent the collection ot' any liquid fuel in the impeller casing,a pipe 21 leads from the bottom thereof back into the chamber 10 aboveits bottom and adjacent the inlet of impeller casing so that liquid fuelin the impeller casing draining down into this pipe may be taken up bythe air and again su jected to the mixing action of the impeller. Thispipe is flattened or otherwise suitably shaped at the bend 21 to spreadout the fuel that may drain into it from the impeller casing, ina thinlayer so as `to facilitate its being again taken up by the air andreturned to the impeller casing.

ln case kerosene or other not readily volatile fuel is used, gasolinemay be introduced into the lchamber 10 on starting the engine through apriming valve 22 connected by a pi 23 with a source of fuel suppl en theengine is start/ed and t e motor 19 put in operation the suction createdby the rapidly rotating impeller 17 draws a stream of air over theliquid fuel vin the Well 9 and through the opening 2Liformed between thedam 1t and the surface of the' ber 10 and thence to the casing 15 W ereit is thoroughly "mixed With the air by the MMD Vanes of the impellerand the mixture thus y formed is deliveredunder a slight pressure to theoutlet 16, trom whence it passes through the manifold to the cylinder orcylinders of the engine. lin this Way a thorough and eicient mixing otthe air and Quel of the motor.

is obtained and a greater charge weight furnished to the engine than ispossible with the usual form of carburetor.

-In cool weather the motor 19 is placed in operation preferably justbefore the engine is turned over for starting in order that the impellermay be rotated rapidly to effect an initial turbulence, which will mixany condensed fuel that may be present. As the istons are caused to movedownwardly on their suction strokes during the starting operation theimpeller will immediately draw fuel and air from the chamber 10 andunder the normal slight pressure will deliver a proper] mixed charge tothe cylinders where it wi l be readily ignited to start the engineApromptly.

The throttle valve 20 serves to control the quantit of mixture deliveredto the intake manifo d and also controls the operation of the impelleras a partially closed throttle will produce a back pressure in theimpeller casing which will cause a decrease in speed of the motor 19 asthe load on the motor is increased under such a condition and an openthrottle will cause an increase in speed I desire it to be understoodthat this invention is not to be limited to any specific form orarrangement of parts except in so far as such limitations are specied inthe claims.

What I claim as new and desire to secure by Letters Patent is:

l. In a carburetor, the combination of a fan casing, a power-drivencentrifugal fan v in said casing, the casing having a central inletpassage conductin air and fuel to the central portion of the an, atangential discharge passage, and a conduit leading from the fan casingand extending into the inlet passage with its opening directed towardthe central portion of the fan for returning anyT unmixed fuel to saidinlet passage.

2. In a carburetor, the combination of a. fan casing, a power-drivencentrifugal fan in said casing, the casing having Ya central inletpassage conducting air andfuel to the fan and a tangential dischargepassage, and a by-p-ass conduit connecting the outer portion of the fancasing with the inlet passage, whereby unmixed fuel will be returnedfrom the fan casing to the inlet passage by an air current from the fan.

3. In a carburetor, the combination of a fan casing, a power-drivencentrifugal fan in said casing, the casing having a central inletpassage conducting air and fuel to the. central portion of the fan andtangential discharge passage, and a U-shaped conduit leading from thefan casing and extending into the inlet passage Withits opening directedtoward the central part of the fan for returning any unmixed fuel tosaid pas- WALTER A. INMAN.

Witnesses:

CONRAD HoLLsTEIN, QI. Jr. DIETMEYR.

